Strong and independent prognostic value of peak circulatory power in adults with congenital heart disease

The identification of patients with adult congenital heart disease (ACHD) who are at higher risk of death is challenging. Peak circulatory power (CircP; expressed as peak exercise oxygen uptake multiplied for peak mean arterial blood pressure) is a strong predictor of death in adults with acquired heart disease. We sought to establish the distribution and the prognostic value of peak CircP across a wide spectrum of patients with ACHD. METHODS: Four hundred thirty-two consecutive patients with ACHD of varying diagnosis underwent cardiopulmonary exercise testing at a single laboratory between 1996 and 2005. Patient age was 32 +/- 10 years. RESULTS: A gradual variation in peak CircP was found across the spectrum of congenital heart defects (P < .0001 at analysis of variance). Reduced peak CircP values were associated with the presence of heart failure symptoms (P < .0001), absence of sinus rhythm (P = .010), and use of antiarrhythmic medications (P = .0013). At a follow-up of 4.4 +/- 2.4 years, 23 patients (5.3%) had died. Peak CircP was a strong predictor of mortality when univariate analysis was used and the strongest independent predictor of mortality among exercise parameters. A peak CircP < or = 1476 mm Hg mlO2 min(-1) kg(-2) was associated with a 15.4-fold increase in the 4-year risk of death. CONCLUSIONS: Peak CircP is abnormal across the spectrum of ACHD. Peak CircP appears as the strongest predictor of adverse outcome in ACHD.